However, in the 1970s and 1980s, the increasingly conservative Republican Party gradually overtook the Democrats in the southeast . The Democrats' support in the formerly Solid South had been eroded during the vast cultural, political and economic upheaval that surrounded the 1960s. By the 1990s the Republican Party had completed the transition into the southeast's dominant political party, despite typically having fewer members due to the prevalence of Republican voting generational Democrats . In New England, the opposite trend took place; the former Republican strongholds of Maine and Vermont became solidly Democratic, as did formerly Republican areas of New Jersey, New York, and Connecticut.

Currently, the majority of the overall number of seats held in the state legislatures has been switching between the two parties every few years. As of the U.S. gubernatorial elections of 2010 , the Republican party holds an outright majority of approximately 440 with 3,890 seats (53% of total) compared to the Democratic party's number of 3,450 (47% of total) seats elected on a partisan ballot. [2] Of the 7,382 seats in all of the state legislatures combined, independents and third parties account for only 16 members, not counting the 49 members of the Nebraska Legislature , which is the only legislature in the nation to hold non-partisan elections to determine its members. Due to the results of the 2010 elections, Republicans took control of an additional 19 state legislative chambers, giving them majority control of both chambers in 25 states versus the Democrats' majority control of both chambers in only 16 states, with 8 states having split or inconclusive control of both chambers (not including Nebraska); previous to the 2010 elections, it was Democrats who controlled both chambers in 27 states versus the Republican party having total control in only 14 states, with eight states divided and Nebraska being nonpartisan. [3]

Current party strength

Gallup

As of October 2017, Gallup polling found that 31% of Americans identified as Democrat, 24% identified as Republican, and 42% as Independent. [50] Additionally, polling showed that 46% are either "Democrats or Democratic leaners" and 39% are either "Republicans or Republican leaners" when Independents are asked "do you lean more to the Democratic Party or the Republican Party?" [50]

In 2014, Gallup found seventeen states safely or leaning Democratic, and fifteen states safely or leaning Republican, with eighteen states categorized as "competitive between the two parties", [117] a net shift of one state to the Republican side since 2013. [9] In February 2016, Gallup found fourteen states safely or leaning Democratic, and twenty states safely or leaning Republican, with sixteen categorized as "competitive", a net Democrat decline of eight states to give the Republicans a six state advantage. This is also the first time in the eight years that Gallup has tracked state partisanship that there have been more Republican than Democratic states, as well as a reversal from the Democratic highs of 2008 and 2009, or even the more recent 2012. [2]

Previously, Gallup observed that the "greatest movement away from the Democratic Party came between 2009 and 2010, when the number of states with a Democratic advantage fell from 34 to 23". At the time, Gallup concluded that "President Obama faces a much less favorable environment as he seeks a second term in office than he did when he was elected president." [11] There have been less significant partisan shifts among the U.S. states since 2011.

Cook Partisan Voting Index (PVI)

Another metric to measure how much a state leans towards one party or the other is the Cook Partisan Voting Index (PVI). Cook PVIs are calculated by comparing a state's average Democratic Party or Republican Party share of the two-party presidential vote in the past two presidential elections to the nation's average share of the same. PVIs for the states over the period 1994–2014 can be used to show the trends of U.S. states towards, or away from, one party or the other. [6]

Elections and voter registrations

The following table shows all the U.S. states and to what party ( Democratic or Republican ) their state governors belong. Also indicated is the majority party of the state legislatures' upper and lower houses as well as U.S. Senate representation. Nebraska's legislature is unicameral , i.e., it has only one legislative house and is officially non-partisan, though party affiliation still has an unofficial influence on the legislative process.

For those states that do not allow for registration by party, Gallup's annual polling of voter party identification by state is the next best metric of party strength in the U.S. states. The partisan figures in the table below for the 22 states that don't register voters by party come from Gallup's 2014 polling of voter party identification by state.

(e) Indicated partisan breakdown numbers are from the Party Identification by State figures for 2014 from Gallup polling (note: Gallup figures have been rounded to two significant figures on the assumption that figures from polling are less accurate than registration-by-party figures). [117]

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